UDAF to convert an aggregation to a map
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Key: HIVE-2843
URL: https://issues.apache.org/jira/browse/HIVE-2843
Project: Hive
Issue Type: New Feature
Components: UDF
Affects Versions: 0.9.0
Reporter: David Worms
Priority: Minor
I propose the addition of two new Hive UDAF to help with maps in Apache Hive.
The source code is available on GitHub at https://github.com/wdavidw/hive-udf
in two Java classes: "UDAFToMap" and "UDAFToOrderedMap". The first function
convert an aggregation into a map and is internally using a Java `HashMap`. The
second function extends the first one. It convert an aggregation into an
ordered map and is internally using a Java `TreeMap`. They both extends the
`AbstractGenericUDAFResolver` class.
Also, I have covered the motivations and usages of those UDAF in a blog post at
http://adaltas.com/blog/2012/03/06/hive-udaf-map-conversion/
If you are interested by my proposal, I'll take the time to update this issue
while following the guideline posted on the wiki to create an appropriate path.
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